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what went wrong?

Discussion in 'Amps and Cabs [BG]' started by billywilde, Aug 3, 2012.

  1. billywilde


    Aug 3, 2012
    hey. not new to music, but am new to amp building and repair. i thought i would take an old traynor 2150 2x15 cab that someone had ditched at my jam space. everything had been gutted out. no speakers, no wires.

    i bought 2 re-coned jbls (for a wicked price), wired them in parellel with 14 gauge braided wire, hooked it up to my mesa fathom head and it works..... kinda.

    it has load hum and popped a few times. if i unplug my bass the hum stops. if i touch the metal on the patchcord when its plugged in, the hum reduces greatly but is still there. i this with 2 patchcords and same results.

    bad wiring job on the cab?
    grounding problem with bass?
  2. Dave W

    Dave W Supporting Member

    Mar 1, 2007
    White Plains
    I'm going to skip right over the speaker part...

    It could be anything. Eliminate one thing at a time. Does the bass or amp make this noise when plugged into a different cabinet? Sounds like a grounding problem in the bass, or at least it sounds like that is part of the problem.
  3. basscooker

    basscooker Commercial User

    Apr 11, 2010
    cincy ky
    Owner, Chopshopamps.com
    grounding. are you using a power conditioner? if not, you should. but like ^ he said, one link at a time, you'll find it.
  4. JimmyM


    Apr 11, 2005
    Apopka, FL
    Endorsing: Ampeg Amps, EMG Pickups
    Power conditioners are glorified power strips. Not necessary.
  5. Mschiff


    Jul 22, 2012
    Memphis, TN
    i like my power conditioner. i did buy the cheapest one i could find. kind of like when an electric component breaks on your car, you start at the fuse block and work your way down the list. in this case it would be the guitar, then on. check the ground wiring in its guts, then ohm the cable and so on. rule out one possibility after another. hope it's something simple.
  6. walterw

    walterw Supportive Fender Gold Supporting Member Commercial User

    Feb 20, 2009
    hum has nothing to do with the speakers, nothing.

    you have a bass, patch cable or amp problem.
  7. dspellman


    Feb 16, 2012
    Bang on.
  8. billywilde


    Aug 3, 2012
    well the bass is a new thunderbird pro with active pickups. i hope its not that. and my amp is fairly new and in great shape, never had a problem with it. and it has an active switch. and i tried all the patches in my house and same thing..... bass? and conditioner?
  9. throbgod13


    Mar 26, 2005
    it's a ground issue..

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